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Woods Hole Oceanographic Institution

Juan Pablo Canales

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Publications
»41. R2K Advances in Seismic Imaging
Oceanography, 2012

»40. R2K Seismic Studies
Oceanography, 2012

»39. Melt bodies off the EPR
Nature Geoscience, 2012

»38. JdF Plate: Gravity structure
G-cubed, 2011

»37. JdF Plate: Layer 2B structure
G-cubed, 2011

»36. Kane waveform tomography
GRL, 2010

»35. Kane Oceanic Core Complex
G-cubed, 2009

»34. Geophysical signatures of oceanic core complexes
GJI, 2009

»33. Accretion of the lower crust
Nature, 2009

»32. Faulting of the Juan de Fuca plate
EPSL, 2009

»31. Axial topography os the Galapagos Spreading Center
G-cubed, 2008

»30. Juan de Fuca Ridge flanks
G-cubed, 2008

»29. Seismic structure of oceanic core complexes
G-cubed, 2008

»28. Juan de Fuca Ridge: structure and hotspots
G-cubed, 2008

»27. Structure of the TAG segment, Mid-Atlantic Ridge
G-cubed, 2007

»26. Detachment faulting at TAG, Mid-Atlantic Ridge
Geology, 2007

»25. Structure of the Endeavour segment, Juan de Fuca Ridge
JGR, 2007

»24. Magma beneath Lucky Strike Hydrothermal Field
Nature, 2006

»23. Magma chamber of the Cleft segment, Juan de Fuca Ridge
EPSL, 2006

»22. Topography and magmatism at the Juan de Fuca Ridge
Geology, 2006

»21. Structure of the southern Juan de Fuca Ridge
JGR, 2005

»20. Sub-crustal magma lenses
Nature, 2005

»19. Constructing the crust at the Galapagos Spreading Center
JGR, 2004

»18. Atlantis core complex
EPSL, 2004

»17. Morphology of the Galapagos Spreading Center
G-cubed, 2003

»16. Crustal structure of the East Pacific Rise
GJI, 2003

»15. Plume-ridge interaction along the Galapagos Spreading Center
G-cubed, 2002

»14. Compensation of the Galapagos swell
EPSL, 2002

»13. Structure of Tenerife, Canary Islands
JVGR, 2000

»12. Underplating in the Canary Islands
JVGR, 2000

»11. Structure of the Mid-Atlantic Ridge (MARK, 23?20'N)
JGR, 2000

»10. Structure of the Mid-Atlantic Ridge (35?N)
JGR, 2000

»9. Structure of Gran Canaria, Canary Islands
J. Geodyn., 1999
»8. Structure of overlapping spreading centers in the MELT area
GRL, 1998

»7. Crustal thickness in the MELT area
Science, 1998

»6. The MELT experiment
Science, 1998

»5. The Canary Islands swell
GJI, 1998

»4. Morphology of the Galapagos Spreading Center
JGR, 1997

»3. Faulting of slow-spreading oceanic crust
Geology, 1997

»2. Flexure beneath Tenerife, Canary Islands
EPSL, 1997

»1. Elastic thickness in the Canary Islands
GRL, 1994



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Ye, S., J.P. Canales, R. Rihm, J.J. Da?obeitia and J. Gallart, A crustal transect through the northern and northeastern part of the volcanic edifice of Gran Canaria, Canary Islands, J. Geodynamics., 28 (1), 3-26, 1999

[PDF]

Abstract

Wide-angle reflection and refraction seismic data were obtained during METEOR cruise 24 in the N and NE of Gran Canaria (GC), Canary Islands. Seismic energy was generated with two 32 L air guns fired at 1 or 2 min intervals. Seven ocean bottom hydrophones (OBH) and 8 mobile land stations recorded seismic arrivals over a network of profiles covering the northern and northeastern sector up to 60 km away from coastline of GC. The detailed structure of the volcanic edifice and the adjacent ocean basin is revealed in the data set along three radial profiles. A 4 km thick sediment sequence overlies the 7 km thick igneous oceanic crust. The basement is characterized by a first order discontinuity with a velocity jump from 3.4 km/s in the sediment to 4.5 km/s. A pronounced lateral velocity variation was found beneath the island. A 5?6 km thick low velocity zone within the central volcanic edifice, at roughly 4?12 km depth south of the island center is interpreted as the Miocene syenitic feldspar-rich core with lower velocity than the recent volcanic core of more mafic composition beneath northern GC. The massive volcanic island flank thins rapidly away from the island with velocities decreasing gradually from 5.0 near the coast to 3.5 km/s in the outermost part 50?60 km away from the coastline. The clear doming of the lower crust (>6.6 km/s) to 8?10 km depth beneath the northern part of GC is attributed to relatively young mafic plutonic rocks. The Moho north and northeast of GC lies almost horizontal; its depth increases slightly from 14 km along the N?S oriented Profile 1 in the west to 16 km along the N?E oriented Profile 3 in the east. A minor flexure of 1?2 km is indicated by a very gentle dip of the Moho beginning around 10?15 km offshore. A zone of magmatic underplating at depths as low as 26 km is found beneath GC. The anomalous velocity?depth function of the igneous oceanic crust north and northeast of GC and the crustal structure beneath the island are clear evidence for fundamental modification and disruption of the original crustal structure by the Canarian magmatic and volcanic activity.

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